readme updated
readme updated

Fixed a typo and updated the readme a bit.

VladimirTyrin/urbansim,waddell/urbansim,UDST/urbansim,SANDAG/urbansim,ual/urbansim,VladimirTyrin/urbansim,waddell/urbansim,UDST/urbansim,bricegnichols/urbansim,waddell/urbansim,synthicity/urbansim,bricegnichols/urbansim,waddell/urbansim,synthicity/urbansim,ual/urbansim,apdjustino/urbansim,VladimirTyrin/urbansim,synthicity/urbansim,apdjustino/urbansim,VladimirTyrin/urbansim,SANDAG/urbansim,SANDAG/urbansim,bricegnichols/urbansim,AZMAG/urbansim,SANDAG/urbansim,UDST/urbansim,apdjustino/urbansim,synthicity/urbansim,AZMAG/urbansim,ual/urbansim,UDST/urbansim,ual/urbansim,bricegnichols/urbansim,AZMAG/urbansim,apdjustino/urbansim,AZMAG/urbansim